Fix volume controls show media instead of call volume during a call. am: 188ab327

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21610510



Change-Id: I8b6e130b00213224011aea8b4ebfb0cff462b07f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>